1. mobile phone:
A mobile phone (also known as a cellular phone, cell phone and a hand phone) is a device which can make and receive telephone calls over a radio link whilst moving around a wide geographic area. It does so by connecting to a cellular network provided by a mobile network operator. The calls are to and from the public telephone network which includes other mobiles and fixed-line phones across the world. By contrast, a cordless telephone is used only within the short range of a single, private base station.
The first hand-held mobile phone was demonstrated by Dr Martin Cooper of Motorola in 1973, using a handset weighing about 2 kg.

2. Advantages: 
you can carry a mobile phone with you so you don't miss important calls
if you are lost, you can call for directions.
if you are in an accident, you can call the police or ambulance - and if the phone has a camera, you can take pictures of the accident.
you can listen to music, text, play games when you're bored. Through mobile phones you can lessen your boredom,example listen to your favorite music and as well as watching movies through downloading.
most mobile phones have a calculator and a phone book.
you can use a mobile phone to call your customers or boss if you are running late to a meeting.
You can surf Internet & Connect with the whole world by Mobile.
You can chat & video conference.
keep in touch with friends and family
good for emergencies

3. Advantages to be continued
Employees can keep in touch at all times.
Customers can contact staff 24/7
Phones have internet connection
More work available 
They have cameras
You can check your s
Can be used worldwide
it can fit in your pocket.
It has a lot of useful function like calendar, making notes, alarm clock, timer and calculator.
Another good thing is when I am shopping, I can go in one and we call each other when we are done to find each other.
Most parents buy mobile phones for their children as a means to keep track of them.   This is possible through a global positioning system (GPS) embedded into most phones, which allows the cellular phone user to be found by way of satellite signals, in the event of loss or emergency. 

4. Disadvantages:
They can damage your ear. Affects our body because of radiation.
sometimes the reception is poor in some areas, limiting your connectivity (you can't talk underground or on planes).
people use the phone while they are driving, and this can cause problems.
They can limit your face to face time with friends and family.  People just contact through phone and became too lazy meeting outside
They can get you in trouble at school
Can be expensive. People spend lots and lots of money buying the latest model
Can ruin the connection to the computer.
Staff can abuse their phones if they have internet connection
Can be hard for older people to use.
Easily broken
Mobile phone makes it easier to invade privacy

35. We humans created mobile phones and it is all up to our control.